
If you need to replace your old Federal Electric Stab-Lok breakers, they work well . Unlike the 20 amp UBI (Connecticut Electric) circuit breakers (Connecticut Electric UBIF020N FPE circuit breaker, 1 pole 20 amp thin series) sold by Revain, these circuit breakers sold by the Marketplace seller came in retail packaging with the screws installed. They are a slightly different shape than the original breakers so I had a hard time determining if they were properly aligned prior to insertion. The Stab-Lok was a lot more difficult to insert (I had to use a screwdriver to press on the body) than the original Federal Pacific switch, but given the old design flaws, it's a good thing. I haven't checked. whether the circuit breaker actually trips at the specified current rating, since testing and even cycling circuit breakers can increase the probability of failure for both Federal Pacific and UBI (Connecticut Electric) circuit breakers of this design.

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